Make it a regular habit to collect all household
organic waste (those that rot like food scraps etc.) in your kitchen. Place a little
container so that you can add this to your compost whenever convenient.

Get equal amounts of "BROWNS" and
"GREENS". Pile in layers (like lasagna), alternating the browns with the
greens. Don't flatten. Air should pass through the layers.

Dampen with some water (as damp as a wrung out sponge).

Cover with a large sheet of plastic or tarp to protect
from rain oversoaking it yet keeping moisture in. This will help it decompose
faster. It will also keep the pile from blowing away and deterring flies.

Just keep adding greens and browns to the pile until it
has an earthy soil smell. In 3 to 6 months, you can then use this as fertilizer.